title: Mitral valve replacements in redo patients with previous mitral valve procedures: mid-term results and risk factors for survival.
abstract: OBJECTIVE
  We aimed to investigate the risk factors for hospital mortality, short (five years) and mid-term (10 years) survival in patients who underwent mitral valve replacements in redo patients with previous mitral valve procedures.
  
  
  METHODS
  Between September 1989 and December 2003, 62 redo patients have undergone mitral valve replacements due to subsequent mitral valve problems. Preoperative, operative, and postoperative data were analyzed retrospectively and evaluated for risk factors affecting hospital mortality, mid- and long-term survival.
  
  
  RESULTS
  The hospital mortality was 6.4%. The one-, five-, and 10-year actuarial survival rates were 94%+/- 2%, 89%+/- 6%, and 81 +/- 9%. New York Heart Association (NYHA) functional class IV, low left ventricular ejection fraction (<35%), increased left ventricular end-diastolic diameter (LVEDD) > 50 mm, female gender, pulmonary edema, and urgent operations were found to be risk factors in short-term survival. NYHA functional class IV, low left ventricular ejection fraction, increased LVEDD, and increased left atrial diameter (LA > 60 mm) were risk factors in mid-term survival.
  
  
  CONCLUSIONS
  Redo mitral valve surgery with mechanical prosthesis offers encouraging short- and mid-term survival. NYHA functional class IV, low left ventricular ejection fraction, and increased left ventricular diameters were especially associated with increased short- and mid-term mortality. Earlier surgical management before the development of severe heart failure and myocardial dysfunction would improve the results of redo mitral valve surgery.
authors.affiliation: Faculty of Medicine, Department of Cardiovascular Surgery, Baskent University, Ankara, Turkey. tankutakay@gmail.com
authors.forename: Tankut Hakki
authors.initials: TH
authors.lastname: Akay
authors.forename: Bahadir
authors.initials: B
authors.lastname: Gultekin
authors.forename: Süleyman
authors.initials: S
authors.lastname: Ozkan
authors.forename: Erdal
authors.initials: E
authors.lastname: Aslim
authors.forename: Emrah
authors.initials: E
authors.lastname: Uguz
authors.forename: Atilla
authors.initials: A
authors.lastname: Sezgin
authors.forename: Sait
authors.initials: S
authors.lastname: Aslamaci
mesh_terms: D005260:Female; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation / Q000009:adverse effects; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery; D008944:Mitral Valve Insufficiency / Q000601:surgery*; D012189:Retrospective Studies; D012307:Risk Factors; D013534:Survival; D013997:Time Factors